what is derating factor in Cable ? how we minimise this?
Answer Posted / helwan university
type of derating factor:
1-soil thermal resistivity
2-grouping factor(cable distrubtion in trays horizontial
-verticals)
3-temp derating factor
4-burial depth derating factor
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plz send me the procedure and syllabus for mseb exam
3 shows a 415 V, 3-phase generator supplying a 3-phase 415/110 V transformer. Draw the individual and combined impedance diagrams to a base of 10 kVA. Determine the system fault kVA and the fault currents at the 415 V and 110 V busbars for short circuit faults on the transformer input or output terminals. Work in p.u. values of impedances.
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